When Jack Lambert as "Bronc Wilson" fights Marshal Jackson in the saloon the stuntman for Lambert has noticeably much darker hair.
The story takes place in the 1890's, but the topless, strapless evening gown that Rose wears at the party is strictly 1948, and no woman in the era being depicted would have dared wear such a creation, even if one did exist.
When Tom asks for Rose at the restaurant, a clear moving shadow of the boom microphone is visible on the counter.